中文摘要：

通过原位聚合方法制备了聚吡咯（PPy）／磷酸铁锂（LiFePO4）复合材料．傅立叶红外光谱测试表明PPy与LiFePO4之间发生了相互作用；采用扫描电镜观察了PPy在LiFePO4表面的分布情况；采用四探针法、电化学阻抗法及恒电流充放电法测试了复合材料的性能．结果表明：PPy的质量分数为4、69％的PPy／LiFePO4复合材料具有最佳的电化学性能，最小电荷转移电阻为98．83Ω，最大交换电流为0．256mA，首次放电容量达到154．34mAh／g，平台容量和平台率分别为133．48mAh／g和86．48％，并且具有较好的循环性能及倍率性能。

英文摘要：

Polypyrrole （PPy）/lithium iron phosphate （LiFePO4） composite was prepared in the in-situ polymerization method. The Fourier Transform Infrared Spectrum （FTIR） proved that there was interaction between PPy and LiFePO4 ; the distribution of PPy on the LiFePO4 surface was observed by Scaning Electron Microscopy （SEM）; the performance of composite was tested by four-probe testing instrument, Electrochemical Impedance Spectroscopy （EIS） and galvanostatic charge and discharge methods. Experiment results have shown that PPy/LiFePO4 composite containing 4.69% PPy possesses minimum charge transfer resistance （98.83%） and maximum exchange current （0. 256 mA） ; it has revealed the most excellent electrochemical performance. The initial discharge capacity is 154.34 mAh/g, its plateau capacity and plateau ratio is 133.48 mAh/g and 86. 48 %, respectively. It displays good rate and cycling capability.